>I am trying to interpolate data from 160x320 resolution (ERA40 TL159 )
>to 94x192 resolution (NCEP/NCAR reanalysis) in order to do some
>comparisons. When trying to use function g2gsh, I was confused by
>parameter 'twave', does anybody have an idea which number should I
>choose for twave, does it matter a lot?
Yes, 62 :-)
Spectral models generally truncate the short waves
for numerical stability reasons. The NCEP Reanalysis
uses triangular truncation at wave 62.
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